In geometry, a translation is the shifting of a figure from one place to another without rotating, reflecting or changing its size. This is done by moving the vertices of the figure the prescribed number of spaces on a coordinate plane and then drawing the new figure.
These PFDs are designed to keep the wearer in a vertical position, but it is the wearersâ responsibility to maneuver themselves into a face-up position. Type III PFDs will keep unconscious wearers face-up just as well as a Type II vest.
1. 1  The Poggendorff illusion and its behavior. (A) When an obliquely oriented straight line is interrupted by a vertical occluder, the line segment on the right appears to be shifted downward with respect to the line segment on the left. (B) A similar effect occurs when the orientation of the interrupted line is reversed.